My first brand new bike. Upgrading from a 1989 Stumpjumper Comp to a 2018 Rockhopper Comp 29er in Rocket Red.

Awesome Bike! i know that model and its a fun ride!
if i may: a cool “cheap” upgrade for that bike:
1) loose the reflectors in the front and back wheel. remove the plastic disk (sometimes refered to as a dork disk) in the back cassette (gears)
2) change the bar Grips to dope orange ones (or other, to make the bike pop) (local bike shop or amazon)
3) same thing wit the pedals (match them with the grips.

these are small things you can do quickly to make your bike “your own”

goood luck and ride on!